WASHINGTON — Representative Don Young and his family routinely used campaign funds for personal expenses, like hunting trips, meals and charter flights to his home in Alaska, a former campaign aide to Mr. Young told federal criminal investigators.

The allegations came to light Friday when the Federal Bureau of Investigation released hundreds of pages of documents from a now-closed investigation into Mr. Young’s role in 2005 in helping steer $10 million to a road project in Florida favored by a campaign supporter.

The investigators ultimately concluded that there was insufficient evidence to charge Mr. Young with wrongdoing in connection with the budget earmark for a highway interchange in Florida that would have benefited a Michigan real estate developer who was a major political donor to Mr. Young, a Republican who has represented Alaska in Congress since 1973.

While gathering evidence in this case, federal investigators examined many other aspects of Mr. Young’s professional and political life, including allegations that he and his wife, Lu Young, used campaign money to support their personal lifestyle.

The former aide to Mr. Young — whose identity had been redacted from the documents released Friday — told investigators in April 2008 that Mrs. Young insisted that the campaign reimburse the couple for meals with friends or family and other expenses.

“Lu Young has a sense of entitlement about most things and can be very mean when she doesn’t get her way,” the former aide to Mr. Young said. “The Youngs don’t think they should have to pay for anything when they are in Alaska, including dinner, laundry and dry cleaning.”

The campaign staff at times objected to the spending — which included charter plane flights to his home in Fort Yukon, in which they often carried supplies to help with a construction project then under way there, the aide told investigators. No campaign events ever took place at the house, the aide said, but the trips were often charged, at least in part, to the campaign.

“There was no doubt,” the former aide said, “that the expenses Lu Young were submitting were inappropriate, and it was a common topic of discussion.”

Mrs. Young died in 2009, while the investigation was under way. John M. Dowd, a prominent Washington white-collar defense lawyer who represented Mr. Young, said the allegations by the former campaign aide were false.

“There is no basis to conclude that he engaged in any wrongdoing,” Mr. Dowd said, adding that it was wrong to now draw attention to four-year-old claims that had already been discredited.

A version of this article appears in print on April 21, 2012, on page A13 of the New York edition with the headline: Alaska Lawmaker Put Campaign Money to Personal Use, Ex-Aide Told Inquiry. Order Reprints|Today's Paper|Subscribe